THE ARCH GROUP OF CLAIMS IS UNDERLAIN BY LOWER JURASSIC SINEMURIAN BEDS CONSISTING OF ARGILLITE, SHALE, SLATE AND MINOR PYROCLASTIC ROCKS WHICH IN TURN ARE OVERLAIN BY THE LOWER JURASSIC ROSSLAND GROUP VOLCANICS COMPRISED OF ANDESITES, BASALTS, PORPHYRITIC FLOWS, AGGLOMERATES AND TUFFS. SMALL GRANITE TO GRANODIORITE STOCKS OF THE NELSON PLUTONIC COMPLEX ARE OCCASIONALLY FOUND INTRUDING THE SEDIMENTS AND VOLCANICS. FELSIC VOLCANICS WITHIN THE ROSSLAND GROUP ACCOMPANIED WITH GEOPHYSICAL CONDUCTORS SUGGESTS A MASSIVE SULPHIDE STYLE OF MINERALIZATION MAY EXIST. THE GEOCHEMICAL SURVEY REVEALED A ZINC SOIL ANOMALOUS ZONE. THE GEOPHYSICAL SURVEY DETECTED SEVERAL INTERESTING COINCIDENT MAGNETIC ANOMALIES AND ELECTROMAGNETIC CONDUCTORS.